Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3599aba69903ba4…

MALICIOUS

PDF

80.1 KB Created: 2021-09-20 01:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14a24b9dde011fc208aa34381a978e09 SHA-1: 02b02fd65c735fdd3751c36169c37b7a09fbb6cb SHA-256: a3599aba69903ba4b11954843d59266cd15bcbdcaccb69f44466a262b0f7ec0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://archism.ru/uplcv?utm_term=grand+theft+auto+v+apk+without+verification
    • http://ambulanceservice.pl/userfiles/file/47964722075.pdf
    • https://uroci-kursove.com/userfiles/file/jenuxasu.pdf
    • http://chothuexeninhbinh.net/data/dulieu/files/91373359951.pdf
    • https://widerbet.pl/userfiles/file/39940606924.pdf
    • https://serviceservice.eu/userfiles/file/30981245594.pdf
    • http://cassotech.nl/site/data/ws/files/jazeseduvi.pdf
    • http://ekmeta.lt/failai/file/7471564992.pdf
    • https://art4you.sk/editor_uploads/system/files/90801585209.pdf
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/visomiwuxazimusova.pdf
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/dunubopuxavowagukilu.pdf
    • https://vinamex.info/uploads/news_file/39791762340.pdf
    • http://studio70.eu/userfiles/files/49853425197.pdf
    • http://casadiriposomarsala.it/userfiles/files/13909254496.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/82242061489.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/22736895673.pdf
    • http://auroraenergyproject.it/userfiles/files/kebemito.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/054762d572ba387eebb50957d647a710/vedenavojobota.pdf
    • https://0286869143.com/editor_images/files/8035992480.pdf
    • http://silver1979.com/upload/file/48705586428.pdf
    • http://35ct1.com/images/ckImageFiles/files/77980019861.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/duzixasibenuvuveveraju.pdf
    • https://momsgardenfoods.com/ckfinder/userfiles/files/32819828104.pdf
    • http://sitoad.com/bbqjoekey/files/202109190234098911.pdf
    • https://drlalashow.com/php/billboard/uploads/file/dapakoleverufekum.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4db59dddf---kegedifemojujubepubizix.pdf
    • http://hla.vn/upload/files/begegewasobijibekotixama.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A5 16792 bytes
font_01_sfnt_off0000ecb7.bin
a26be428a9efc0b595b26dbc4fd23933ffed57f8f8286eb741250c65d54e537c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECB7 17212 bytes
font_02_sfnt_off00011938.bin
e6fb4650677027a5c0980eeda2dfd3cce4f3dd06eb256909c80a1211ab2031aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11938 10884 bytes

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